Liquid-fuel burner



June 12, 1928.

R. M. HORTVET LIQUID FUEL BURNER Filed NOV. 22, 1926 2 Sheets-Sheet l In venior: R M. Hort've't.

fli'tor'neya.

June 12, 1928.

RM. HORTVET LIQUID FUEL BURNER Filed Nov. 22, 1928 2 Sheets-Sheet 2 In venor: R. M. Hor-fvez.

Patented June 12, 1928.

NITED STATES arat PATENT RICHARD M. HOR'IVET, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MAHIR MANU- FACTURING 00., OF MINNEAPOLIS, MINNESOTA,

A CORPORATION.

LIQUID-FUEL BURNER.

Application filed November 22, 1926. Serial No. 149,900.

My invention relates to liquid fuel burners, and an object is to provide a burner for high temperature work in drop forging furnaces and for other industrial purposes sue as annealing, plate heating, heat-treating, rivet heating, and core-oven heating. Another object is to provide a burner in which the liquid fuel is subjected to a triple atomizing action of air and also to provide for conveniently controlling the air which is supplied. 7

The full objects and advantages of my invention will appear in connection with the detailed description thereof, and the novel features of my inventive idea will be particularly pointed out in the claims.

In the accompanying drawings which i1- lustrate a practical embodiment of my invention 1 is a view in horizontal section on the line 1 l of Fig. 2. Fig. 2 is a view invertical section on the line 22 of Fig. 1. Fig. 3 is a view in vertical section on the line 3-3 of Fig. 2. Fig. 4 is a View in vertical section on the line 44 of Fig. 2. Fig. 5 is a view in vertical section on the line 55 of Fi 2.

n the embodiment of the invention shown in the drawings, a casing is provided which consists of a lower member 10 and an upper member 12, these members being secured to-' gether by screw bolts 14. The lower front portion of the casing member 10 is extended and is provided with an opening having a convergent surrounding wall 16. Back of this extended ortion, the casing is provided with a vertica partition 18, the upper portion of which is provided with an opening 26 adapted to be closed by a disk 22 secured to the forward end of a rod 24. This rod has a threaded portion which engages a threaded opening in the rear wall of the casing so that the disk 22 may be moved eitner toward or away from the opening 20 by turning a handle 26 secured to the rear end of the rod. The lower portion of the partition 18 is provided with an opening which is surrounded by an annular guide flange 28 which slidably receives the rear portion of a sleeve 30 whose forward end is reduced and provided with a thin front edge 32. The forward portion of the sleeve 30 has a diametrically extending web 34 by means of which it is integrally connected with the enlarged forward end of a rod 36. The shape of this enlarged forward end is best shown in Fig. 2 in which the upper portion of the web 34 is broken away. From this view, it will be understood that the web is connected to a conical surface 38 the base of which joins with the base of a conical surface 40, the latter surface being truncated where it joins with the main portion of the rod 36. This rod extends longitudinally through a hollow member 42, the rear portion of which has an opening 44 through which the interior of the hollow member 42 is in communication with the main chamber 46 of the casing member 10. The rear end of the hollow member 42 is enlarged to form a closure and is secured by screw bolts 48 to the material surrounding an opening in the rear portion of the casing member 10. The rod 36 is threaded and passes slidably through a smooth opening in the rear portion of the member 42 and at its rear end is provided with a thumb nut 50, rotation of which causes the rod 36 to move backwardly or forwardly according to the direction of rotation of the nut, the latter being held from longitudinal movement by a lug 52 on the member 42 engaging a shoulder 54 on the nut. The member 42 is provided with a longitudinal passageway 56 for the introduction of liquid fuel. This passageway extends into a circular recess "58 formed in the forward portions of the member 42. From the recess 58 a number of perforations 60 extend through the interior surface of the member 42 which at this place is provided with an interior constriction 62 which constitutes a venturi. The casing member 12 is provided with a tubular extension 64 which provides a passageway for introduction of air into the casing. The amount of air which passes into the lower casing member is regulated by a cover plate 66 which fits slidably over the chamber 46 of the lower casing member. The plate 66 carries a stem 68 which is surrounded by a coiled spring 70 lying in a socket 72 formed at one end of ice an arm 74, the other end of which is secured to a rod 76 passing up through the upper wall of the member 12 and provided with a handle 78. By turning the handle 78, the

cover plate 66 is slid in order to regulate the gas amount of air passing into the chamber 46.

The operation and advantages of my invention will be readily understood in connection with the fore oing description. Liquid fuel is introduc through the pas- 11a sageway 56 from which it is discharged through the radially and inwardly extending perforations 60 out of the hollow memher through the venturi constriction 62 where it is subjected to the atomizing action of the air which passes through the opening 44 into the hollow member. Another portion of the air passes between the sleeve 30 and the hollow member 42 and causes a further atomizing action between th sleeve and the conical surface 38. \Vhen the disk 22 is moved into open position. some of the air passes through the opening 20 and then between the convergent walls 16 and the sleeve 30 to produce a still further atomizing action at the thin edge 32 of the sleeve. The result of this triple atomizing action is to produce an extremely hot flame. The amount of air may be properly regulated by shifting the cover plate 56. The amount of air passing to the end of the burner may be regulated by adjusting the disk 22. From Fig. 2 it will be apparent that when the sleeve 30 is moved toward the left, the space between this sleeve and the end of the hollow member 42 will be decreased and the space between the conical surface 40 and the constriction 62 will be decreased at the same time that the space between the sleeve 30 and the inclined surface 16 is increased. When the sleeve 30 is moved toward the right, the reverse action occurs. It is apparent that a construction has been provided by means of which a wide range of adjustment is possible. This adjustment provides for various conditions according to the character of the work which is being treated by the flame. On account of the various adjustments for the air which is supplied to the burner, the proper amount of air may be supplied to suit various liquid fuels. By proper adjustment of the sleeve, a short flame can be produced, thereby bringing the maximum temperature close to the burner which results in a longer life for the furnace lining and the crucibles. The advantages of my liquid fuel burner may be summarized as follows:

1. Complete atomizing and combustion of the liquid fuel. a

2. Three distinct stages of atomizing of the liquid fuel.

3. Maintenance of uniform temperature in the furnace.

4. Wide range of control for regulation of the length of flame on account of the several adjustable members of the burner.

5. Ability to easily light the burner without production of smoke and without dripping of the liquid fuel.

6. Freedom of the burner from formation of carbon.

7. Capability of the burner for operation on low pressure air.

8. Simplicity of design of the burner.

I claim:

1. A liquid fuelburner comprising a casing having an air inlet, the lower portion of said casing being enlarged at its front side, a partition separating the space in the enlarged portion of the casing from the main space therein, said partition containing an opening for passage of air into said first mentioned space, an adjustable closure device for regulating the amount of air passing through said opening, a second opening; in said partition, a sleeve slidably mounted in said second opening, means for adjusting said sleeve longitudinally, the enlarged portion of said casing containing an outlet openin within which the forward portion of sai sleeve is interiorly spaced, and a hollow member in said casing interiorly spaced from said sleeve, said hollow memher having passages therein for delivering liquid fuel to the interior thereof and also having an opening through which air passes to the place of delivery of the liquid fuel for atomizing the latter.

2. A liquid fuel burner comprising a casing having an air inlet, a hollow member in said casing, said hollow member having passages therein for delivery of liquid fuel to the interior thereof and also having an opening through which air passes centrally to the place of delivery of the liquid fuel for atomizing the latter, a" slidable sleeve spaced around said hollow member for passage of additional air to the stream of atomized fuel, said sleeve having an interior an-' nular inclined surface cooperatively related to the forward end of. said hollow member a rod connected to said slidable member and having an inclined surface cooperatively related to the passage way through said hollow member, said rod extending to the out side of said casing, and a movable member outside of said casing connected to said rod for adjusting the latter and said sleeve longitudinally so that said inclined surfaces cause both of said supplies of air to be increased when said outside member is moved in one direction and both of said supplies of air to be decreased when said outside additional air to the stream of atomized fuel,

a movable member mounted outside of said casing and connected with said sleeve for adjusting the latter longitudinally, and inclined surfaces carried by said sleeve c0- operating with said hollow member for increasing both of said supplies of air when said sleeve is moved in one direction and for decreasing both of said supplies of air when said sleeve is moved in the other direction.

4. A liquid fuel burner comprising a casing having an air inlet, a hollow member in said casing, said hollow member having passages therein for delivery of liquid fuel to the interior thereof and also having an opening through which air passes centrally to the place of delivery of the liquid fuel for atomizing the latter, a slidable sleeve spaced around said hollow member for passage of additional air to the stream of atomized fuel, means for adjusting said sleeve longitudinally, and inclined surfaces carried by said sleeve cooperating with said hollow member for increasing both of said supplies of air when said sleeve is moved in one direction and for decreasing both of said supplies of air when said sleeve is moved in the other direction.

In testimony whereof I hereunto affix my signature.

RICHARD M. HORTVET. 

